Mary Kay Letourneau reveals ways she stayed in contact with her student-lover while in prison

20/20 - A BARBARA WALTERS EXCLUSIVE - ABC News' Barbara Walters interviews Mary Kay Letourneau Fualaau and husband Vili Fualaau, on the eve of their 10th anniversary sharing intimate details about their headline-making marriage, which will air on 20/20 on FRIDAY, APRIL 10 (10-11 pm, ET) on the ABC Television Network.  (Photo by Heidi Gutman/ABC via Getty Images)  VILI FUALAAU, MARY KAY LETOURNEAU FUALAAU

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20/20 - A BARBARA WALTERS EXCLUSIVE - ABC News' Barbara Walters interviews Mary Kay Letourneau Fualaau and husband Vili Fualaau, on the eve of their 10th anniversary sharing intimate details about their headline-making marriage, which will air on 20/20 on FRIDAY, APRIL 10 (10-11 pm, ET) on the ABC Television Network. (Photo by Heidi Gutman/ABC via Getty Images) VILI FUALAAU, MARY KAY LETOURNEAU FUALAAU

Mary Kay Letourneau spent seven-and-a-half years in jail for having an affair with a 12-year-old student, Vili Fualaau. PEOPLE reports that although Letourneau was forbidden from having any contact with Fualaau after she went to jail in 1998, she was able to court him for years before they married in 2005.

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In the Letourneau episode of “Barbara Walters Presents American Scandals,” Walters spoke to author Gregg Olsen, who covered the case in his book “If Loving You Is Wrong: The Shocking True Story of Mary Kay Letourneau.” According to Olsen, Letourneau had several inventive ways of communicating with Fualaau.

“Mary stayed in touch with Vili in a lot of different ways,” Olsen said to Walters. “One way was to send out messages in ... milk bottles she was [producing] milk in prison for her babies, so she put little notes in the caps and they went out.”

Olsen said Letourneau also sent out audiotapes and had fellow prisoners call Fualaau for her, as she was forbidden from contacting him while in prison.

Letourneau herself spoke about the bottle messages in an interview with Dateline in 2006. She said the messages in the bottles were coded for Fualaau.

RELATED: It seems that Mary Kay Letourneau will do anything to keep Vili Fualaau from leaving her.

‘”104’ was ‘I love you,'” Letourneau told Josh Mankiewicz. “And if I wasn’t feeling good, or if something was going wrong—there was another one. And then I would write names of songs down. Because the lyrics express how I feel.”

Fualaau said the messages made him “feel really good, really happy about it.”

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